I make a Django admin site using Django development version
But it does not have a CSS style :
I ran into this issue as well following the Django Book Tutorial. In Chapter 5|Installing the model, the book states when referring to the default INSTALLED_APPS- "Temporarily comment out all six of those strings by putting a hash character (#) in front of them." http://www.djangobook.com/en/2.0/chapter05.html
Then, in Chapter 6, the Book tells the reader to uncomment 4 of those 6 lines- "note that we commented out these four INSTALLED_APPS entries in Chapter 5. Uncomment them now."
But the statcifiles line is what is needed to restore CSS to the admin page, so uncomment that 'django.contrib.staticfiles',